抄録
This report is devoted to one of topical questions of a seismic building - to specification of seismicity of a territory depending on concrete soil conditions of the building area. It is noticed that the method of seismo-districts widely applied now possesses suffer from grave shortcomings, in particular, with reference to concrete soil conditions. It in great degrees concerns a choice of the reference soil corresponding to seismicity of territory on a card of seismic zoning. For definition increment mark of seismicity on others soils concerning the reference the indicator of acoustic rigidity (product of density of a soil for speed of distribution of seismic waves) and position of level of subsoil waters is used. At such approach to the question decision all soils (except rock) give an identical increment mark, irrespective of their properties and conditions. As have shown results of numerous experimental researches, question decisions above-mentioned by practically in all cases yield the results far differing from observed phenomenon in the nature. It is based on that the indicator of acoustic rigidity not in all soils depends on their humidity (sand, gravel, rubble, rigid clay and rock). Humidity of a soil can be a matter only for clay soils in plastic conditions. Besides in the given approach to the question decision are not considered physic-mechanical and stability indicators of a concrete soil, in each special case providing its seismic stability. The proposed method offered by the author is deprived above mention lacks.
